-// Rust-101, Part 05: Clone
-// ========================
-
-// ## Big Numbers
-
-pub struct BigInt {
- pub data: Vec<u64>,
-}
-
-// Now that we fixed the data representation, we can start implementing methods on it.
-impl BigInt {
- pub fn new(x: u64) -> Self {
- if x == 0 {
- BigInt { data: vec![] }
- } else {
- unimplemented!()
- }
- }
-
- pub fn test_invariant(&self) -> bool {
- if self.data.len() == 0 {
- true
- } else {
- unimplemented!()
- }
- }
-
- // We can convert any vector of digits into a number, by removing trailing zeros. The `mut`
- // declaration for `v` here is just like the one in `let mut ...`, it says that we will locally
- // change the vector `v`.
- //
- // **Exercise 05.1**: Implement this function.
- //
- // *Hint*: You can use `pop()` to remove the last element of a vector.
- pub fn from_vec(mut v: Vec<u64>) -> Self {
- unimplemented!()
- }
-}
-
-// ## Cloning
-fn clone_demo() {
- let v = vec![0,1 << 16];
- let b1 = BigInt::from_vec((&v).clone());
- let b2 = BigInt::from_vec(v);
-}
-
-impl Clone for BigInt {
- fn clone(&self) -> Self {
- unimplemented!()
- }
-}
-
-// We can also make the type `SomethingOrNothing<T>` implement `Clone`.
-use part02::{SomethingOrNothing,Something,Nothing};
-impl<T: Clone> Clone for SomethingOrNothing<T> {
- fn clone(&self) -> Self {
- unimplemented!()
- }
-}
-
-// **Exercise 05.2**: Write some more functions on `BigInt`. What about a function that returns the number of
-// digits? The number of non-zero digits? The smallest/largest digit?
-
-// ## Mutation + aliasing considered harmful (part 2)
-enum Variant {
- Number(i32),
- Text(String),
-}
-fn work_on_variant(mut var: Variant, text: String) {
- let mut ptr: &mut i32;
- match var {
- Variant::Number(ref mut n) => ptr = n,
- Variant::Text(_) => return,
- }
- /* var = Variant::Text(text); */
- *ptr = 1337;
-}
-